Can't purchase books on apple books

Anytime I want to purchase a book on the Apple Books app, it won't let me. What happens is that I click on the price e.g. I click on the button that displays $14.99, input the correct password, and then the icon starts spinning in a circle but the purchase never actually goes through. I wait a bit, refresh the app, and that purchase never went through. It doesn't work on ipad nor on iphone